'Serve Other Gods' in the Bible

According to all the works that they have done from the day of My bringing them up out of Egypt, even unto this day, when they forsake Me, and serve other gods -- so they are doing also to thee.

Now therefore, I pray thee, let my lord the king hear the words of his servant. If the LORD have stirred thee up against me, let him accept an offering: but if they be the children of men, cursed be they before the LORD; for they have driven me out this day from abiding in the inheritance of the LORD, saying, Go, serve other gods.